/**
* Lookup with version checking.
*
* This checks version of 'name'. Many reint functions uses 'name' for child not
* FID, therefore we need to get object by name and check its version.
*/
int mdt_lookup_version_check(struct mdt_thread_info *info,
struct mdt_object *p, struct lu_name *lname,
struct lu_fid *fid, int idx)
{
int rc, vbrc;
rc = mdo_lookup(info->mti_env, mdt_object_child(p), lname, fid,
&info->mti_spec);
/* Check version only during replay */
if (!req_is_replay(mdt_info_req(info)))
return rc;
info->mti_ver[idx] = ENOENT_VERSION;
if (rc == 0) {
struct mdt_object *child;
child = mdt_object_find(info->mti_env, info->mti_mdt, fid);
if (likely(!IS_ERR(child))) {
mdt_obj_version_get(info, child, &info->mti_ver[idx]);
mdt_object_put(info->mti_env, child);
}
}
vbrc = mdt_version_check(mdt_info_req(info), info->mti_ver[idx], idx);
return vbrc ? vbrc : rc;
}
/* partial operation for rename */
static int mdt_reint_rename_tgt(struct mdt_thread_info *info)
{
struct mdt_reint_record *rr = &info->mti_rr;
struct ptlrpc_request *req = mdt_info_req(info);
struct md_attr *ma = &info->mti_attr;
struct mdt_object *mtgtdir;
struct mdt_object *mtgt = NULL;
struct mdt_lock_handle *lh_tgtdir;
struct mdt_lock_handle *lh_tgt = NULL;
struct lu_fid *tgt_fid = &info->mti_tmp_fid1;
struct lu_name *lname;
int rc;
ENTRY;
DEBUG_REQ(D_INODE, req, "rename_tgt: insert (%s->"DFID") in "DFID,
rr->rr_tgt, PFID(rr->rr_fid2), PFID(rr->rr_fid1));
/* step 1: lookup & lock the tgt dir. */
lh_tgtdir = &info->mti_lh[MDT_LH_PARENT];
mdt_lock_pdo_init(lh_tgtdir, LCK_PW, rr->rr_tgt,
rr->rr_tgtlen);
mtgtdir = mdt_object_find_lock(info, rr->rr_fid1, lh_tgtdir,
MDS_INODELOCK_UPDATE,
MDT_OBJ_MUST_EXIST);
if (IS_ERR(mtgtdir))
RETURN(PTR_ERR(mtgtdir));
/* step 2: find & lock the target object if exists. */
mdt_set_capainfo(info, 0, rr->rr_fid1, BYPASS_CAPA);
lname = mdt_name(info->mti_env, (char *)rr->rr_tgt, rr->rr_tgtlen);
rc = mdo_lookup(info->mti_env, mdt_object_child(mtgtdir),
lname, tgt_fid, &info->mti_spec);
if (rc != 0 && rc != -ENOENT) {
GOTO(out_unlock_tgtdir, rc);
} else if (rc == 0) {
/*
* In case of replay that name can be already inserted, check
* that and do nothing if so.
*/
if (lu_fid_eq(tgt_fid, rr->rr_fid2))
GOTO(out_unlock_tgtdir, rc);
lh_tgt = &info->mti_lh[MDT_LH_CHILD];
mdt_lock_reg_init(lh_tgt, LCK_EX);
mtgt = mdt_object_find_lock(info, tgt_fid, lh_tgt,
MDS_INODELOCK_LOOKUP,
MDT_OBJ_MUST_EXIST);
if (IS_ERR(mtgt))
GOTO(out_unlock_tgtdir, rc = PTR_ERR(mtgt));
mdt_reint_init_ma(info, ma);
if (!ma->ma_lmm || !ma->ma_cookie)
GOTO(out_unlock_tgt, rc = -EINVAL);
rc = mdo_rename_tgt(info->mti_env, mdt_object_child(mtgtdir),
mdt_object_child(mtgt), rr->rr_fid2,
lname, ma);
} else /* -ENOENT */ {
rc = mdo_name_insert(info->mti_env, mdt_object_child(mtgtdir),
lname, rr->rr_fid2, ma);
}
/* handle last link of tgt object */
if (rc == 0 && mtgt)
mdt_handle_last_unlink(info, mtgt, ma);
EXIT;
out_unlock_tgt:
if (mtgt)
mdt_object_unlock_put(info, mtgt, lh_tgt, rc);
out_unlock_tgtdir:
mdt_object_unlock_put(info, mtgtdir, lh_tgtdir, rc);
return rc;
}